$\int_0^\pi \frac{dx}{1 - 2a\cos x + a^2} = $

  • A
    $\frac{\pi}{2(1 - a^2)}$
  • B
    $\pi(1 - a^2)$
  • C
    $\frac{\pi}{1 - a^2}$
  • D
    इनमें से कोई नहीं

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